24 THE VOYAGE OF H.M.S. CHALLENGER. 



Habitat.— (a) Station 146. December 29, 1873. Lat. 46° 46' S., long. 45° 31' E. 

 Depth, 1375 fathoms. Three specimens, {h) Station 157. March 3, 1874. Lat. 53° 55' 

 S., long. 108° 35' E. Depth 1950 fathoms. One specimen, (c) Station 195. October 3, 

 1874. Lat. 4° 21' S., long. 129° 7' E. Depth, 1425 fathoms. One specimen. 



Colour. — Not recognisable in a ; blue-violet in b (determined from a spirit specimen) ; 

 pale reddish-yellow in c (determined by Moseley in the fresh condition). 



Dimensions. — Height, 1-2 cm.; breadth of the oral disk, 2"5-6 cm.; of the pedal 

 disk, r5-6 cm. 



The specimen on which Moseley founded his characteristics of the species Corallimorphus 

 rigidus was not among the material handed over to me for investigation. He states that it 

 came from a depth of 1425 fathoms, and was taken between the Banda Islands and Amboyna 

 on October 3, 1874. On the other hand, two other bottles contained Corallimorphidse, 

 which answered, on the whole, to Moseley's description. The differences were merely those 

 of colour and form, which might be easily caused by preservation and by difference of 

 age, so that I considered it best to determine these specimens as Corallimorphus rigidus. 



1 found one specimen in a bottle marked "Station 157; March 3, 1874; 1950 

 fathoms," which also contained a Cereus spinosus, and in another bottle—" Station 

 146 ; December 29, 1873 ; 1375 fathoms," — there were three specimens, along with a 

 number of other Actiniae. The first specimen was admirably preserved, and therefore 

 formed the principal object of my investigation. I shall deal with it exclusively in what 

 follows, recurring at the conclusion to the variations in the three other specimens. 



The body of the animal is discoid, as the pedal disk and oral disk are of equal 

 size (6 cm.), and lie exactly parallel, whilst the height does not amount to more than 



2 cm. The tentacles are deep blue-violet, the remainder of the body paler and even 

 whitish in some parts. 



The pedal disk (fig. 5) is furnished with forty-eight equally distinct radial furrows, 

 which are limited to the outer third, and gradually become shallower as they run inwards ; 

 they do not correspond to the insertions of the septa, but to the interseptal spaces between 

 them. The margin of the pedal disk and lower part of the wall is slightly inverted 

 and indented, in such a way that an indentation comes in the interspace between each 

 two radial furrows. 



The points at which the septa are inserted in the wall (fig. 4) are recognisable by 

 longitudinal furrows only half-way up the middle part ; they are otherwise covered 

 by pad-like thickenings, which are placed near the base in such a way that the furrow 

 between each two pads occupies the middle between the insertions of two septa. Moseley 

 also describes these pads, but gives them a different position, as he terms them " smooth, 

 slightly projecting, rounded ridges or costae, corresponding in position to the intervals 

 l^etween the attachments of the mesenteries." The conditions differ somewhat near the 

 oral disk. Here there is a broad circular swelling, which is traversed by a number of 



